feat: initialize backend environment with Docker setup and configuration files

.gitignore

@@ -1,6 +1,3 @@
-backend/.env
-# Ignore environment files
-
 index.html
 # Ignore frontend dev file
 

README.md

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+# Login page
+This is an app which I am currently working on...
+
+## How to run?
+1. Install docker on your machine
+2. Then run the docker-compose file and make sure that port ```4000``` and ```3306``` are not in use.
+3. Then enter the mysql container (exec) with the credentials that you can see in the ```docker-compose.yml``` file and in the ```.env``` file.
+4. Then login with the root user with ```mysql -u root -p```, after that enter the password from the ```docker-compose.yml``` file or the ```.env``` file.
+5. Then type ```use login_page;```
+6. Then create a table with the following scheme (extract from scheme.sql): 
+``` sql
+-- Table structure for the database
+CREATE TABLE users (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    username VARCHAR(50) NOT NULL UNIQUE,
+    first_name VARCHAR(50) NOT NULL,
+    last_name VARCHAR(50) NOT NULL,
+    email VARCHAR(100) NOT NULL UNIQUE,
+    password VARCHAR(255) NOT NULL,
+    created TIMESTAMP NOT NULL DEFAULT NOW()
+);
+
+-- Mock data for users
+INSERT INTO users (username, first_name, last_name, email, password)
+VALUES 
+('test1', 'John', 'Doe', 'jdoe@example.com', '1test'),
+('test2', 'Alice', 'Smith', 'asmith@example.com', '2test');
+```
+
+If you are confident with sql you can change the mock data, and create your own user.

backend/.env

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+DB_HOST=mysql
+DB_USER=root
+DB_PASSWORD=D7Ze0lwV9hMrNQHdz1Q8yi0MIQuOO8
+DB_NAME=login_page

backend/Dockerfile

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+FROM node:18
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+EXPOSE 4000
+
+CMD ["npm", "start"]

docker-compose.yml

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+version: '3.9'
+
+services:
+  backend:
+    container_name: login-page
+    build: ./backend
+    ports:
+      - "4000:4000"
+    environment:
+      DB_HOST: mysql
+      DB_USER: root
+      DB_PASSWORD: D7Ze0lwV9hMrNQHdz1Q8yi0MIQuOO8
+      DB_NAME: login_page
+    depends_on:
+      - mysql
+    volumes:
+      - ./backend:/app
+    restart: unless-stopped
+
+  mysql:
+    container_name: mysql-db
+    image: mysql:8.0
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: D7Ze0lwV9hMrNQHdz1Q8yi0MIQuOO8
+      MYSQL_DATABASE: login_page
+    volumes:
+      - mysql-data:/var/lib/mysql
+    ports:
+      - "3306:3306"
+
+volumes:
+  mysql-data: